Surgical saw



M. LANGwoRTHY.

SURGICAL SAW.

APPLICATION FILED MAR. 5, 1921.

1,417,669. Patented May 30,Y 1922. i

PATENT ',oFfFirfcs. l

MITCHELL LANGWORTHY, or sPoKANn, WASHINGTON, 1 v

SURGICAL SAW.

`T all whom t may concern:

Be it known that I, MircrinLL LANG- w'oRTHY, a citizen of the United States, re-

siding at Spokane, in Spokane County, and

the State of Washington, have invented certain new and useful Improvements in Surgical Saws, of which the following is a specilication.

My vpresent invention relates to improvements in surgical saws of the motor operated, rotary type, by means-of which cranial andl other incisions orl cuts may be made v with laccuracy and'precision, to required depths. K L

The primary object of the invention is the A provision of an instrument of this character which is comparatively simple in construction and operation and composed of a minimum number of parts which are assembled and'capable of being dismantled in such manner as to permit sterilization, and the motor for4 operating thel `instrument is adaptedto' receivea sterilized covering, thus ,insuring perfect sanitary conditions Iandv cleanliness in thefuse ofthe instrument.

` By the utilization of my invention many different styles of incisions or cuts, with the l instrument at various angles, may be made, l,and the, saw manipulated to penetrate to unusual depths. 4. l

p The invention consists in certain nov-el combinations and arrangements of parts, in-

, volvingthe driving motor heregillustrated as an electric motor, and certain features of construction, as will be hereinafter more fully pointed out and claimed.

y In the accompanying drawings I have illustrated one vcomplete example and a modification of the operating parts thereof, '40* have thus far devised. for the practical ap-` plication of the principles'of my invention.

constructed according to thefbest mode I In the physical embodiment of the inven- Figure 1 is a perspective view of a rotary saw and its connected electric motor, the4 motor being4 shown without its covering, for

convenience of illustration.

Figure 2 is a side view, partly broken away,l of the enlarged arm at the end of` which the saw is carried, disclosing a train of operating gears within the armor casing.

4Figure 3 is a view similar to Figure 2 with a sprocket drive between the motor lthe saw arm andthe saw.

Specification of Letters Patent.

up of a pair of complementary grooved As best seen in Figure 4' the end of concave-convex disk or plate, to the outer Patented May 3o, ieee.

Application filed march 5, 1921. Seria1 No; 449,826.' 4

Figure 4 is atransversesectional viewat the junctionof the saw' arm with the motor.k

Figure 5 is a sectional of Figure 2.

Figure 6 isatransverse sectional viewat the end of the arin,throu0ih the rotary-saw operatively carried thereby. f igure 7 isa side View of the arin v'at-the saw 'end showing the detachableI saw guard. Figure 8- is an edge view of the device of Figure. ,F

Figure 9 Iis a small view illustratingthe` sterilized covering over the motor andthe electric wires thereto. a

In the preferred'form of the invention as illustrated in the drawings I have utilized well known or'standard type of electric niotor -1 with its driving shaft 2 protruding therefrom, and thesaw 3 is of the disk type, vof which various sizes may be used to adapt it to diiferent-conditions. The saw is operated from themotor and carried at the side of a tubular arm creasing 4, which is made` plates 5 and Gsuitably attached together,

view at line '5f- 5 .soA

and readily detachable, in order that the"4 Various parts may be'sterilized` and cleansed.

The tubular arm'is ofa size and shape to be conveniently held by fthe operator' in manner similar to the manner in which a within the tubular arm `is encased a train of operating gears including the 'driving gear 7, a driven gear 8 at the saw endof the'arm, vand a series of intermediate, co-acting gears pen or pencil isretaiiied in the hand, and i 9, the latter being journaledy by'their trunn ions 10in the complementary platesforming the tubular arm, yand `all the gears being encased in the flat tubular arin`4 as shown. Y driving' gear 7 is fixed on theendof vthe motor shaft 2, by means of its elongated hub or sleeve 11 which bears against the threaded boss 12 of the motor, through which boss the motor shaft 'projects as shown. An 'attaching nut 13 is threaded over `the end of the boss, andl the plate 5 of the arm 4 is secured to this nut by means of attaching screws 14 as shown. Bearing ringsflla may be interposed be# Ltween the hub 11 and the two perforatedk ends of the plates 5 and 6 lof the arm, to

ioo

smooth rotation of the driving gear 7 while a cap 15 may be attached, in the form of a plement'ary to the saw,

face of lthe plate 6 to shield the bearing of the gear. All of the gears are encased within the complementary grooves of the two plates 5 and 6, and the train of gears is retained in alinement within the tubular arm inorder to be effective in their operation vvof transmitting thepower ofthe -motor through its shaft and the gears, to the saw. e A flange or disk 16, provided with an open center is fitted over they nut 13 adjoining the motor, and the bag 17 which coversthe motor is drawn tight around tliisiflange to secure the bag, while la tubular extension 18 is provided on the for the electric .con-` ductors or wires of the motor. Thus, the

arm and train of gears, together witi the.

saw, may be sterilized, and the bag v17 and its extensionlS may also be sterilized to be used as asanitary covering v'for the motor and wires, as a protection against iniiection. The saw 3, which is located laterally of the arm, and projects beyond its ree end, is

attached to the arm by means of a cap'plate or disk 19, and a complementary, inner plate 20, between the sawand its arm is provided with a sleeve 21 to which the driven gear 8 is red. As best seen in Figure 6 the outer disk 19 isfashioned with a central pin 20 passing through the sleeve 21, and at the outer side of the arm remote from the saw a third cap plate 22 is attached to the arm by screws as seen in Figure 1. Thus it will beapparent that saw 3, the plate 20,`its sleeve 21,V andthe Adriven gear 8 revolve together, the saw being guided and heldin stable position by theI plate 19 and the arm, and the journal bearing being closed by the retaining plate 22 attached at .thel outer sidel of the arm as shown.y j

The saw is provided with a guard or shield 28 of arcuate shape which lencases a portion of the periphery of the saw or its cutting teeth, and this guai-'d is fashioned with an attaching ybracket 24 secured to the arm 1 by a screw 25, and held in rigid position by Vthe set pin 26 passingjthroiigh the slot 2T of the bracket and secured in the armkwhich latter is tapped for the reception of the screw. The saw may be of various sizes, and

the guard is also made in various sizes commay be changed at will, toadapt' them for i different uses.

In Figure 3 a modified form of power transmission isillustrated, wherein the driv- Acility and and these elements saw (not shown) isoperated through this i sprocket'drive from the motor 1a.

rlfhetubular arm is of convenient size to be grasped between the ingers andthumb, and-the tapered saw-end of the-arm, readily adapts the arm for receiving and carrying the saw at 'the side' thereo'I as indicated. The

yarm, which 'forms a casing't'or the gears or transmission mechanism may be highly polished for cleanliness andthe operating parts are of coursesterilized preliminary to surgical operations. Thearm may readily be manipulated to attain cutsat various angles and depths for cranial and other cuts, and the laterally disposed saw affords an instrunient which may be manipulated 'with faaccuracy in the operations. In preparing the instrument, the arm which has previously been sterilized in boiling water is attached to the motor, which has been encased. in the sterilized bag* with the cords ,i

in the extension, and a drawstring or other tension device is used to close the bag over 'flange-16. The tubular arm, which performs V'alsothe function of a handle, is grasped by the operator.' and the usual manipulations are proceeded with. A, V i

' VJhat l claim and desire to secure byLetters Patentis# 1. The combination with a motor yandits shaft and a threaded bosson'said'motor, of ay tubular arm, a nut on said arm for attachy driving i wheel on. saidl nient to said boss, a j shaft located in thetubular arm, a driven arm and operatively connected l with said vwheel encased within the reeend ofsaid Y di'ivewheel, and a laterally disposed rotary' saw operatively*connected withsaid driven wheel. i j i 'e j 2. The combination withv .a motor, of `a detachable, tubular arm and transmission mechanism therein, driving mechanism connecting said motor and transmission mechanism, driven member journaled inthe 'free end iiriroiii-iLLl LANewoRTHY. x

of the arm and .actuated froml said transmission mechanism, arotary ysaw rigid with said member, disposed at the side of 1 I 10.5 i 

